WO1997023355A1 - Bande de transfert thermique - Google Patents

Bande de transfert thermique Download PDF

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Publication number
WO1997023355A1
WO1997023355A1 PCT/EP1996/005688 EP9605688W WO9723355A1 WO 1997023355 A1 WO1997023355 A1 WO 1997023355A1 EP 9605688 W EP9605688 W EP 9605688W WO 9723355 A1 WO9723355 A1 WO 9723355A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
thermal transfer
wax
transfer ribbon
ribbon according
Prior art date
Application number
PCT/EP1996/005688
Other languages
German (de)
English (en)
Inventor
Heinrich Krauter
Original Assignee
Pelikan Produktions Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pelikan Produktions Ag filed Critical Pelikan Produktions Ag
Priority to US08/894,512 priority Critical patent/US6033767A/en
Priority to DE59602240T priority patent/DE59602240D1/de
Priority to EP96943998A priority patent/EP0810924B1/fr
Publication of WO1997023355A1 publication Critical patent/WO1997023355A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/392—Additives, other than colour forming substances, dyes or pigments, e.g. sensitisers, transfer promoting agents
    • B41M5/395—Macromolecular additives, e.g. binders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/423—Intermediate, backcoat, or covering layers characterised by non-macromolecular compounds, e.g. waxes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/913—Material designed to be responsive to temperature, light, moisture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/914—Transfer or decalcomania
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y10T428/24967—Absolute thicknesses specified
    • Y10T428/24975—No layer or component greater than 5 mils thick

Definitions

  • the invention relates to a thermal transfer ribbon with a conventional carrier and thermotransferable layers arranged thereon.
  • Thermal transfer ribbons have been known for a long time. On a film-like carrier, for example made of paper, a plastic or the like, they have a thermal transfer color, in particular in the form of a plastic and / or wax-bound colorant or carbon black layer. In thermal printing technology, the thermal transfer ink is softened by means of a thermal print head and transferred to a recording paper or a printing paper. Thermal printers or thermal print heads that can be used for this process are known for example from DE-AS 24 06 613 and DE-OS 32 24 445. In particular, e.g. as follows: On the thermal print head of the printer, a letter consisting of heated dots and to be printed on a paper sheet is formed. The thermal print head prints the thermal transfer ribbon on a paper to be written on.
  • the heated letter of the thermal print head with a temperature of about 400 ° C leads to the fact that the thermal transfer ink softens at the heated point and is transferred to the paper sheet in contact with it.
  • the used part of the thermal transfer ribbon is then fed to a spool.
  • the thermal transfer ribbon can have different thermal transfer colors side by side. With the combination of the basic colors blue, yellow and red, colored print images can be produced. Compared to the usual color photography, there is no disadvantageous development and fixing.
  • the number of dots per row of dots is between 6 and 64, which corresponds to a resolution of 2 to 16 dots / mm. Higher resolutions, eg 24 to 32 dots / mm, are expected in the near future. It is characteristic of the serial thermal head that it is moved horizontally to the transport direction of the paper during the printing process. In contrast to the serial print head, a line print head is a stationary head or a bar. Since the print bar is not movable, it must span the width of the substrate to be printed. Print bars are available in lengths of up to 297 mm. The resolution and dot size correspond to those of serial heads.
  • serial printers are used in typewriters, video printouts, in the PC area and in word processors, while the line printers are used in particular in the case of barcode graphic printers, in the case of a computer output unit in the event of large amounts of data, in the facsimile, ticket printer, address printer, color copier and CAD / CAM system.
  • thermal transfer ribbons In addition to the thermal transfer ribbons described above, there are also those in which the heat symbol is not embossed by the action of a thermal print head, but by resistance heating of a specially designed film-like carrier. Resistance heating takes place in that the thermal transfer ink and / or its carrier contain electrically conductive materials.
  • the thermal transfer ink which is the actual "functional layer” during the printing process, also contains the materials already described above. This is also known as an ETR material ("Electro Thermal Ribbon").
  • ETR material Electro Thermal Ribbon
  • the font sharpness and the optical density of the font produced depend, inter alia, on the adhesion of the thermal transfer ink to the paper. This is proportional to the adhesive area and the adhesive force.
  • Rough paper has a small adhesive area, since only the raised parts of the paper surface are wetted by the melted thermal transfer ink.
  • a so-called "filling layer” is therefore formed on the layer of thermal transfer ink, which consists of a low-viscosity material in the molten state, which flows into the valleys of the rough paper surface during printing and so on the adhesive surface increases.
  • the disadvantage here is that the melted filling layer cannot penetrate into the paper in the case of very smooth paper with a roughness of more than 200 Bekk during the printing process, so that a layer remains between the paper surface and the color layer.
  • This layer therefore has the effect of a hold-off layer, as described in EP-A-0 042 954.
  • this hold-off layer leads to poor document authenticity, since it prevents the thermal transfer ink from penetrating into the paper.
  • a hold-off layer effect is undesirable for a document-correct layer.
  • EP-B-0 348 661 proposes that the hold-off layer or adhesive layer, also as Topcoat means incorporating a tackifying hydrocarbon resin embedded in a paraffin in finely divided form, the paraffin having a melting point of 60 to 95 ° C.
  • the teaching according to EP 0 206 036 tries to avoid the need for such an adhesive layer or a top coat by forming a wax layer on the layer of a plastic-bound thermal transfer ink and the plastic-bound thermal transfer ink containing a thermoplastic plastic with a softening point of 60 to 140 ° C.
  • the thermal ribbons described above are finding more and more use in high-speed printers, particularly in the industrial sector, a print head of the so-called "real-edge” or “corner-type” type being used here. With these printheads, the row of dots is arranged near the edge or directly on the edge on a ceramic substrate.
  • the advantage of the edge-type heads is shorter cooling times and, accordingly, a higher writing frequency.
  • Print speeds of 3 to 12 "per second can be achieved with it
  • High-speed printing in particular in the case of high-speed color printing, prints are subject to special requirements with regard to print quality, ie good edge sharpness, resolution and optical density.
  • a special area of application is the printing of paper and plastic labels. On the latter, a high scratch resistance of the prints is desirable.
  • the object of the invention was therefore to provide a thermal transfer ribbon with which high printing speeds can be achieved with satisfactory printing quality.
  • the thermal transfer ink transferred during printing is said to show good adhesion and good scratch resistance, particularly on paper and plastic labels.
  • thermotransferable layer containing waxes with a melting point of about 70 to 110 ° C. and about 1 to 22% by weight of a polymer Wax plasticizer a glass temperature Tg of -30 to + 70 ° C, and
  • thermo-transferable layer containing colorant, wax-compatible polymeric binder and about 5 to 30% by weight of wax and / or wax-like substance, the thermo-transferable layer (ii) having a melting enthalpy ⁇ H of about 10 to 80 J / g having.
  • layer (ii) also contains about 5 to 40, in particular about 10 to 20,% by weight of fillers.
  • the thermal print head With high-speed printing, the thermal print head only stays for a very short time at a specific point on the thermal transfer belt. On the other hand, since the
  • thermotransferable layer with a low enthalpy of fusion can be used for Achieving high printing speeds with advantage.
  • layer compositions with a low enthalpy of fusion in the molten state have a high adhesion to carrier materials, so that the result would be an insufficient transfer to the receiving substrate during the printing process.
  • the invention solves this problem by a specially designed layer (i) between the support and the layer (ii) with low enthalpy of fusion.
  • the waxes used in layer (i) follow the usual wax definition with the above limitation of the melting point to about 70 to 110 ° C. In the broadest sense, it is a material that is solid to brittle, hard, coarse to fine crystalline, translucent to opaque, but not glassy, melts above approx. 70 ° C, but is relatively low-viscosity and not stringy just above the melting point. Waxes of this type can be divided into hydrocarbon waxes (alkanes without functional groups) and waxes from long-chain organic compounds with functional groups (especially ester and acid waxes). In addition to earth wax, hydrocarbon waxes include solid hydrocarbons extracted from oil and tar, as well as synthetic paraffins.
  • the waxes with functional groups include all vegetable waxes and chemically modified waxes.
  • Ester waxes essentially consist of esters which are formed from linear carboxylic acids with about 18 to 34 carbon atoms and linear alcohols of about the same length. Acid waxes contain large amounts of free carboxylic acids. Waxes with functional groups are preferred. Ester waxes, for example based on montan wax, partially saponified ester waxes, acid waxes and oxidized and esterified synthesis waxes are particularly worth mentioning here.
  • the particularly preferred ester waxes include vegetable waxes, such as carnauba wax and candelilla wax, and high-melting, narrow-cut paraffins. Waxes with a melting point of 70 to 105 ° C.
  • Layer (i) further contains about 1 to 22% by weight, preferably about 2 to 20% by weight and in particular about 4 to 10% by weight, of polymeric wax plasticizer.
  • Ester waxes are very hard or brittle waxes, ie they can be pulverized when cold.
  • polymeric wax plasticizers If these are mixed with the designated polymeric wax plasticizers, elastic products are created that can hardly be pulverized.
  • the stated amount of polymeric wax plasticizer is critical. Higher amounts than those specified should be avoided, because otherwise the release effect to the carrier is not sufficient. Too little polymer wax plasticizer may result in the brittle wax being insufficiently plasticized and layer (i) showing no closed peeling or leading to an inhomogeneous image, especially in coherent color areas.
  • Polymers, copolyesters, polyvinyl acetate and polystyrenes with a glass transition temperature Tg of -30 to + 70 ° C. are suitable as polymer wax plastifiers.
  • polyesters and copolyesters are preferred. These are preferably linear saturated polyesters or copolyesters with an average molecular weight of 1500 to 18000.
  • Layer (i) usually has an enthalpy of fusion ⁇ H of approximately 150 to 210 J / g.
  • Layer (ii) has an enthalpy of fusion ⁇ H of about 10 to 80, in particular about 15 to 50 J / g.
  • Prior art thermal transfer color layers usually have a melting enthalpy ⁇ H of over 130 to 220 J / g.
  • the "melting enthalpy ⁇ H” is understood to mean the endothermic amount of energy which is embodied by the peak area which is included in the DSC measurement in the temperature interval 25 to 120 ° C. by the heat flow temperature curve and the baseline. In the specified temperature interval, the layer composition (ii) does not necessarily have to melt completely, which is regularly the case when the layer contains dispersed insoluble components such as fillers.
  • the layer (ii) shows at least one phase transition in the specified temperature interval, in which it changes from the solid state to a relatively low-viscosity state, and this phase transition causes a peak in the DSC calorigram that corresponds to the specified amount of energy. If several peaks occur, the sum of the peak areas must be used. In order to achieve a sufficiently low enthalpy of fusion, particular attention must be paid to the choice of binder.
  • the binder of layer (ii) must also be wax-compatible so that layer (ii) has sufficient adhesion to layer (i).
  • Wax-compatible is understood here to mean that this polymer is compatible with a liquid wax and that no phase separation occurs when a solution or a dispersion of the polymer is cooled in wax.
  • Wax-compatible polymers in the sense of the invention are distinguished by the fact that they are meltable below about 100 ° C. They show stickiness in the molten state.
  • Suitable polymers are, for example, ethylene-vinyl acetate copolymers (EVA), ethylene-acrylic acid copolymers, polyamides and ionomer resins. Of these, ethylene-acrylic acid copolymers and EVA are preferred, in particular one with a vinyl acetate content> about 25% by weight; Types with at least about 33 or 40% by weight vinyl acetate are particularly suitable.
  • Layer (ii) also contains about 5 to 30% by weight, in particular about 15 to 25% by weight, waxes and / or wax-like substances.
  • the addition of the waxes and / or wax-like substances prevents the tape from sticking in the rolled-up state or from sticking to the receiving substrate at places where no symbol is to be transferred. Avoid adding more wax than specified because the high melting enthalpy of wax would make the melting enthalpy of the entire formulation of layer (ii) too high.
  • a low addition of wax leads to a low enthalpy of fusion, but does not avoid sticking to the desired extent.
  • Suitable waxes for layer (ii) are: closely cut paraffin waxes, ester waxes, acid waxes, micro waxes and modified micro waxes.
  • Natural waxes are not preferred. Narrow paraffin waxes are particularly preferred. The waxes listed are characterized by the fact that the softening and melting points are close together. When heating up should at least 80% of the material becomes molten within a temperature range of 10 ° C. The melting point of the waxes in layer (ii) is preferably about 70 to 105C.
  • Layer (ii) is preferably also filled with extenders, such as e.g. Aluminum silicate, aluminum oxide, silica, talc, calcium carbonate, aluminum hydroxide, zinc oxide, silica, china clay, titanium dioxide etc. are added.
  • extenders such as e.g. Aluminum silicate, aluminum oxide, silica, talc, calcium carbonate, aluminum hydroxide, zinc oxide, silica, china clay, titanium dioxide etc. are added.
  • the fillers lighten the color (transparent layers) and at the same time the "adhesive behavior" of the tape is influenced favorably.
  • the layer of thermal transfer ink preferably contains one or more resins with a melting point of 80 to 150 ° C.
  • Suitable resins are e.g. KW resins, terpene phenolic resins, modified rosins, coumarone indene resins, maleate resins, alkyd resins, phenolic resins, polyester resins, polyamide resins and / or phthalate resins.
  • KW resins and polyterpene resins are particularly preferred.
  • the ratio of wax-compatible polymer to resin in the thermal transfer ink is preferably 70:30 to 90:10 (w / w).
  • Layer (ii) can be colored by any colorant. It can be pigments, such as, in particular, carbon black, but also solvent and / or binder-soluble colorants, such as the commercial product Basoprint, organic color pigments and various azo dyes (Cerces and Sudan dyes). Carbon black is particularly suitable in the context of the present invention.
  • Layer (ii) preferably contains the colorant, in particular color pigment, in an amount of about 10 to 20% by weight.
  • the viscosity of layer (ii) must be sufficiently low so that the color can be released quickly and precisely.
  • the thermal transfer ink of the thermal transfer ribbon according to the invention preferably has a viscosity of about 500 to 3000 mPa.s, measured with a Brookfield rotary viscometer at 140 ° C. In particular, the range from 600 to 1500 mPa.s is aimed for.
  • the polymeric binder used in layer (ii) is amorphous or at most partially crystalline and requires little energy for the melting process. After the printing process, the thermal transfer ribbon is separated from the acceptor as long as layer (ii) is still "liquid", ie in the molten or softened state.
  • Layer (i) preferably has a thickness of approximately 0.5 to 4 ⁇ m, in particular approximately 1 to 2 ⁇ m.
  • Layer (ii) is preferably about 1 to 5 ⁇ m, in particular about 1 to 3 ⁇ m, thick.
  • the type of carrier of the thermal transfer ribbon according to the invention is also not critical. It is preferably polyethylene terephthalate film (PETP) or capacitor papers.
  • PETP polyethylene terephthalate film
  • the selection parameters are the highest possible tensile elongation values and thermal stability with low film thicknesses.
  • the PETP films are available down to about 2.5 ⁇ m, capacitor paper down to about 6 ⁇ m.
  • a layer of a wax or wax-like material is formed on the back of the carrier, in particular in a Thickness of not more than 1 ⁇ m and very particularly preferably in the form of a molecularly formed up to 0.01 ⁇ m, in this case the coating material preferably consists of paraffin, silicone, natural waxes, in particular carnauba wax, beeswax, ozokerite and paraffin wax or synthetic waxes, in particular acid waxes , Ester waxes, partially saponified ester waxes and polyethylene waxes, glycols or polyglycols and / or surfactants.
  • additives that improve the properties of the tape.
  • the skilled person will select the one with which he would like to set a desired effect within the framework of craft considerations.
  • the teaching according to the invention can be used with particular advantage in color printing.
  • the creation of color prints by color mixing with the help of thermal transfer printing is normally carried out according to the principle of subtractive color mixing.
  • the subtractive color mixing is achieved by superimposing colorants on a white substrate, namely through the secondary colors yellow, magenta and cyan.
  • a white substrate namely through the secondary colors yellow, magenta and cyan.
  • thermal transfer printing this means that at least these three colors on one or more ribbons in transferable form, i. H. embedded in a thermal transfer ink.
  • a fourth "color" namely black, for example based on carbon black, can be provided, since often a mixed black does not meet the requirements.
  • These three or four transferable colors can be added to the printer in different ways.
  • the colors can be on three or four separate ribbons, which are guided past the thermal print head one after the other.
  • Another way is the arrangement of the colors on a band, whereby they can either be arranged in a strip shape next to one another ("line striped") in segment form one behind the other ("crossed striped”), or they can be arranged in a mosaic-like manner.
  • the autotypical color mixing is also possible with high-resolution thermal print heads. With this type of color mixing, the secondary colors are not only printed one above the other, but also side by side. This gives you a much wider range of color options that go beyond the possibilities of pure subtractive color mixing.
  • yellow is only printed on the print substrate, while magenta and cyan are also placed on areas that have already been printed.
  • the adhesive properties of the printing inks must be adjusted accordingly.
  • the thermal transfer ribbon according to the invention can be produced in a variety of ways using customary application methods. This can be done, for example, by spraying or printing a solution with dispersion, be it with water or an organic solvent as the dispersion or solvent, by applying from the melt, which applies in particular to the wax-bound layer (i), or by applying by means of a doctor knife in the form of an aqueous suspension with finely divided material to be applied. Coating methods such as reverse roll and / or gravure coating have proven to be particularly advantageous for the application of both the release and the color layers.
  • the following general conditions can be specified with regard to the application quantities of the individual layers: on a carrier film, in particular polyester film with a thickness of approximately 2 to 8 ⁇ m, in particular with a thickness of approximately 4 to 5 ⁇ m, are applied in succession: coating composition to form layer (i) 0.5 to 4 g / m 2 , preferably approximately 0.5 to 2 g / m 2 , and coating composition to form layer (ii) 1 to 5 g / m 2 , preferably approximately 1 to 2 g / m 2 .
  • an above-mentioned is on the back of the wearer I tung a thickness of about 0.01 to 0.2 g / m 2, in particular from about 0.05 to 0, 1 g / m 2 is formed.
  • Carnauba wax (mp: 38-85 ° C) 95 parts by weight of polyester resin (Tg: -4 ° C) 5 parts by weight
  • the above material is applied with a doctor blade in a solvent dispersion (about 8 to 12%, toluene / isopropanol 80:20) in a dry thickness of about 1.5 ⁇ m.
  • the solvent is evaporated by passing hot air at a temperature of around 100 ° C.
  • Layer (ii) is then applied using the following recipe in the form of a solvent dispersion (about 15% strength, toluene / isopropanol 80:20) by means of reverse roll.
  • Layer (ii) had an endothermic enthalpy of fusion ⁇ H of 38 J / g (according to determination by DSC on a Mettler TA 3000 device (heating rate l, 34 ° C./min).
  • Example 1 was repeated with the modification that the following recipes were used for layers (i) and (ii): Layer (i):
  • Polyester resin (Dynapol ® ,
  • Layer (ii) had an endothermic enthalpy of fusion ⁇ H of 17 J / g (heating rate, 68 ° C./min).

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

Bande de transfert thermique pour impression à grande vitesse, présentant un support classique sur lequel sont appliquées les couches indiquées dans l'ordre ci-après: (i) une première couche à transfert thermique, renfermant des cires à point de fusion compris entre environ 70 et 110 °C, et environ 1 à 22 % en poids d'un plastifiant cireux polymère, d'une température de transition vitreuse Tg de -30 à +70 °C, et (ii) une deuxième couche à transfert thermique, renfermant un colorant, un liant polymère compatible avec la cire et environ 5 à 30 % en poids de cire et/ou d'une substance analogue à la cire, la couche (ii) présentant une enthalpie de fusion ΔH d'environ 10 à 80 J/g.
PCT/EP1996/005688 1995-12-22 1996-12-18 Bande de transfert thermique WO1997023355A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US08/894,512 US6033767A (en) 1995-12-22 1996-12-18 Thermo-transfer strip
DE59602240T DE59602240D1 (de) 1995-12-22 1996-12-18 Thermotransferband
EP96943998A EP0810924B1 (fr) 1995-12-22 1996-12-18 Ruban pour transfert thermique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19548401A DE19548401A1 (de) 1995-12-22 1995-12-22 Thermotransferband
DE19548401.0 1995-12-22

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US08/906,631 Continuation-In-Part US5985422A (en) 1996-08-08 1997-08-07 Thermo-transfer color ribbon for luminescent lettering

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/169,567 Continuation-In-Part US6376056B1 (en) 1996-08-08 1998-10-09 Thermo-transfer ribbon for luminescent letters

Publications (1)

Publication Number Publication Date
WO1997023355A1 true WO1997023355A1 (fr) 1997-07-03

Family

ID=7781188

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/005688 WO1997023355A1 (fr) 1995-12-22 1996-12-18 Bande de transfert thermique

Country Status (5)

Country Link
US (1) US6033767A (fr)
EP (1) EP0810924B1 (fr)
CA (1) CA2228275A1 (fr)
DE (2) DE19548401A1 (fr)
WO (1) WO1997023355A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1493594A3 (fr) * 2003-06-30 2005-08-10 Fujicopian Co., Ltd. Matériau d'enregistrement par transfert thermosensible

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6376056B1 (en) 1996-08-08 2002-04-23 Pelikan Produktions Ag Thermo-transfer ribbon for luminescent letters
DE19744956C2 (de) * 1997-10-10 2002-10-31 Pelikan Produktions Ag Egg Thermotransferband für lumineszierende Schriftzeichen
DE19820779A1 (de) * 1998-05-08 1999-11-11 Pelikan Produktions Ag Egg Thermotransferband
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DE59602240D1 (de) 1999-07-22
CA2228275A1 (fr) 1997-07-03
EP0810924A1 (fr) 1997-12-10
US6033767A (en) 2000-03-07
DE19548401A1 (de) 1997-07-03

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